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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="property_tree.appendices"></a><a class="link" href="appendices.html" title="Appendices">Appendices</a>
</h2></div></div></div>
<h4>
<a name="property_tree.appendices.h0"></a>
      <span class="phrase"><a name="property_tree.appendices.compatibility"></a></span><a class="link" href="appendices.html#property_tree.appendices.compatibility">Compatibility</a>
    </h4>
<p>
      Property tree uses partial class template specialization. There has been no
      attempt to work around lack of support for this. The library will therefore
      most probably not work with Visual C++ 7.0 or earlier, or gcc 2.x.
    </p>
<p>
      Property tree has been tested (regressions successfully compiled and run) with
      the following compilers:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
          Visual C++ 8.0
        </li>
<li class="listitem">
          gcc 3.4.2 (MinGW)
        </li>
<li class="listitem">
          gcc 3.3.5 (Linux)
        </li>
<li class="listitem">
          gcc 3.4.4 (Linux)
        </li>
<li class="listitem">
          gcc 4.3.3 (Linux)
        </li>
<li class="listitem">
          Intel C++ 9.0 (Linux)
        </li>
</ul></div>
<h4>
<a name="property_tree.appendices.h1"></a>
      <span class="phrase"><a name="property_tree.appendices.rationale"></a></span><a class="link" href="appendices.html#property_tree.appendices.rationale">Rationale</a>
    </h4>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
          <span class="bold"><strong>Why are there 3 versions of <code class="computeroutput"><a class="link" href="../boost/property_tree/basic_ptree.html#id-1_3_33_10_7_1_1_1_3_63-bb">get</a></code>?
          Couldn't there be just one?</strong></span> The three versions reflect experience
          gathered during several of years of using property tree in several different
          applications. During that time I tried hard to come up with one, proper
          form of the get function, and failed. I know of these three basic patterns
          of usage:
          <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                <span class="emphasis"><em>Just get the data and I do not care if it cannot be done.</em></span>
                This is used when the programmer is fairly sure that data exists.
                Or in homework assignments. Or when tomorrow is final deadline for
                your project.
              </li>
<li class="listitem">
                <span class="emphasis"><em>Get the data and revert to default value if it cannot be
                done.</em></span> Used when you want to allow omitting the key in
                question. Implemented by some similar tools (windows INI file access
                functions).
              </li>
<li class="listitem">
                <span class="emphasis"><em>Get the data, but I care more whether you succeeded than
                I do for the data itself.</em></span> Used when you want to vary control
                flow depending on get success/failure. Or to check for presence of
                a key.
              </li>
</ul></div>
        </li></ol></div>
<h4>
<a name="property_tree.appendices.h2"></a>
      <span class="phrase"><a name="property_tree.appendices.future_development"></a></span><a class="link" href="appendices.html#property_tree.appendices.future_development">Future
      Development</a>
    </h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
          More parsers: YAML, environment strings.
        </li>
<li class="listitem">
          More robust XML parser.
        </li>
<li class="listitem">
          Mathematical relations: ptree difference, union, intersection. Useful for
          finding configuration file changes etc.
        </li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2008-2010 Marcin Kalicinski<br>Copyright © 2010-2013 Sebastian
      Redl<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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